#!/bin/sh
# Copyright © 2005-2010  Roger Leigh <rleigh@codelibre.net>
#
# schroot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# schroot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################

set -e

. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"
. "$SETUP_DATA_DIR/common-config"

if [ "$CHROOT_TYPE" = "btrfs-snapshot" ]; then

    if [ $STAGE = "setup-start" ]; then

        if [ ! -d "$CHROOT_BTRFS_SOURCE_SUBVOLUME" ]; then
            fatal "Btrfs source subvolume directory '$CHROOT_BTRFS_SOURCE_SUBVOLUME' does not exist"
        fi
        if [ ! -d "$CHROOT_BTRFS_SNAPSHOT_DIRECTORY" ]; then
            fatal "Btrfs snapshot directory '$CHROOT_BTRFS_SNAPSHOT_DIRECTORY' does not exist"
        fi

        info "Creating snapshot $CHROOT_BTRFS_SNAPSHOT_NAME from subvolume $CHROOT_BTRFS_SOURCE_SUBVOLUME"

        if [ "$VERBOSE" = "verbose" ]; then
            btrfs subvolume snapshot "$CHROOT_BTRFS_SOURCE_SUBVOLUME" \
                "$CHROOT_BTRFS_SNAPSHOT_NAME"
        else
            btrfs subvolume snapshot "$CHROOT_BTRFS_SOURCE_SUBVOLUME" \
                "$CHROOT_BTRFS_SNAPSHOT_NAME" > /dev/null
        fi

    elif [ $STAGE = "setup-stop" ]; then

        if [ -d "$CHROOT_BTRFS_SNAPSHOT_NAME" ]; then

            info "Deleting snapshot $CHROOT_BTRFS_SNAPSHOT_NAME"

            if [ "$VERBOSE" = "verbose" ]; then
                btrfs subvolume delete "$CHROOT_BTRFS_SNAPSHOT_NAME" || true
            else
                btrfs subvolume delete "$CHROOT_BTRFS_SNAPSHOT_NAME" > /dev/null || true
            fi

        else
            # The block device no longer exists, or was never created,
            # for example on lvcreate failure.
            warn "$CHROOT_BTRFS_SNAPSHOT_NAME does not exist (it may have been removed previously)"
        fi

    fi

fi

